I can't say 100% without seeing the jersey in hand, but there are several encouraging signs. Russell made the Bengals unies until 1988, when a tranisition to Champion began during the season (photos of both suppliers' jerseys can be seen on Getty 1988 Bengals entries). The handwarmer makes sense, and the chopped-off left sleeve shows up on a couple of Getty road jersey photos from 1987 (not a big leap to assume his home jerseys were similarly affected). Most Esiasons that I have seen are size 50s, but they're nearly all 1990s vintage...a 48 for early-career would be reasonable. I hope this helps.

Dave M.
Chicago area